R
jX
Operating characteristic
Impedance locus at
power swing
IEC09000224_1_en.vsd
IEC09000224 V1 EN-US
Figure 66: Impedance plane with Power swing detection operating
characteristic and impedance locus at power swing
7.2.2.2 Basic characteristics
M13874-11 v6
Power swing detection function (ZMRPSB) reliably detects power swings with
periodic time of swinging as low as 200 ms (which means slip frequency as high as
10% of the rated frequency on the 50 Hz basis). It detects the swings under normal
system operation conditions as well as during the dead time of a single-pole
automatic reclosing cycle.
ZMRPSB function is able to secure selective operation for internal faults during
power swing. The operation of the distance protection function remains stable for
external faults during the power swing condition, even with the swing (electrical)
centre located on the protected power line.
The operating characteristic of the ZMRPSB function is easily adjustable to the
selected impedance operating characteristics of the corresponding controlled
distance protection zones as well as to the maximum possible load conditions of
the protected power lines. See the corresponding description in “Technical
reference manual” for the IEDs.
7.2.3 Setting guidelines
SEMOD52042-5 v5
Setting guidelines are prepared in the form of a setting example for the protected
power line as part of a two-machine system presented in figure
67.
1MRK 505 393-UEN B Section 7
Impedance protection
Line differential protection RED650 2.2 IEC 135
Application manual
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